Originally Posted by
Kaiser
The steel/polyester/nylon/rayon plies of the radial belt can break, causing them to separate. This causes lumps in the tire and eventually spreads across the whole tire as the stress from the separated belts cause other belts to break.
Anyways, a brief and simple rule of thumb is: Most Vibrations between 40-55 are caused by imbalance that has to do with the weights of the tire being off, and can be fixed by a balancing machine. Vibrations that are more severe above 55 than in the 45-55 range are caused by Road Force, which is the tire assembly being overall out of round. This can be because of a bad tire or a bent wheel, or both. This can be measured by a newer balance with road force measuring and can sometimes be fixed by Indexing the tire to the wheel, so that they make a better assembly overall. Doesn't always work. Low-speed vibrations are often caused by something being loose in the suspension.
My suggestion? As soon as possible check every bolt for tightness, could be a number of things, not the least of which is the already suggested loose lugnuts. Could be a bad tire too though.
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